Originally Posted by
FlyingFrZ
As for the concierge, I simply provided four options where I couldn't attempt to book online my self. They won't book anything outside of our stay with them sadly

What were the four options?
That is the case with every hotel, and also big limitation of relying on concierge to book for you.
Sawada might be a last minute possibility for you as he opens seats on Omakase one week in advance, with the caveat that the majority will be single seats, but it's possible to luck out and grab a reservation for two.
Suzuki in Ginza maybe another option, his dinner is a bit pricey but lunch is a good value.
If you don't mind a small trek to Saitama and paying cash, Inomata (a Tabelog silver) is pretty much always available.